http://en.wikipedia.org/wiki/Computer-aided_manufacturing;;;
Integration of CAD with other components of CAD/CAM/CAE Product lifecycle management (PLM) environment requires an effective CAD data exchange. Usually it had been necessary to force the CAD operator to export the data in one of the common data formats, such as IGES or STL, that are supported by a wide variety of software. The output from the CAM software is usually a simple text file of G-code, sometimes many thousands of commands long, that is then transferred to a machine tool using a direct numerical control (DNC) program.;;;

Ah. Well, I actually don’t have an XP box that’s not domain attached so I cant test this but, what I would try next is:

Check the box, “Reconnect at logon”. Then, under that box Click the Text: “Connect using a different User name”. Enter in the credentials and PW and hopefully that does the trick.

If not, then try this LAST DITCH EFFORT. Go into Control panel, User Accounts, Advanced Tab, Manage Passwords. Click Add and enter in the Server and User & PW. This should use these credentials anytime you connect to resources from that server.
Let me know
-MrGroove